56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
// Copyright (C) 2015 Alexandre Janniaux
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Posix/HardwareInfoImpl.hpp>
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#include <Nazara/Core/Error.hpp>
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#include <Nazara/Core/Debug.hpp>
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void NzHardwareInfoImpl::Cpuid(nzUInt32 code, nzUInt32 result[4])
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{
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#if defined(NAZARA_COMPILER_CLANG) || defined(NAZARA_COMPILER_GCC) || defined(NAZARA_COMPILER_INTEL)
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// Source: http://stackoverflow.com/questions/1666093/cpuid-implementations-in-c
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asm volatile ("cpuid" // Besoin d'être volatile ?
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: "=a" (result[0]), "=b" (result[1]), "=c" (result[2]), "=d" (result[3]) // output
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: "a" (code), "c" (0)); // input
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#else
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NazaraInternalError("Cpuid has been called although it is not supported");
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#endif
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}
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unsigned int NzHardwareInfoImpl::GetProcessorCount()
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{
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// Plus simple (et plus portable) que de passer par le CPUID
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return sysconf(_SC_NPROCESSORS_CONF);
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}
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bool NzHardwareInfoImpl::IsCpuidSupported()
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{
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#ifdef NAZARA_PLATFORM_x64
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return true; // Toujours supporté sur un processeur 64 bits
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#else
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#if defined(NAZARA_COMPILER_CLANG) || defined(NAZARA_COMPILER_GCC) || defined(NAZARA_COMPILER_INTEL)
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int supported;
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asm volatile (" pushfl\n"
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" pop %%eax\n"
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" mov %%eax, %%ecx\n"
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" xor $0x200000, %%eax\n"
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" push %%eax\n"
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" popfl\n"
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" pushfl\n"
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" pop %%eax\n"
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" xor %%ecx, %%eax\n"
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" mov %%eax, %0\n"
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" push %%ecx\n"
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" popfl"
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: "=m" (supported) // output
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: // input
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: "eax", "ecx", "memory"); // clobbered register
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return supported != 0;
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#else
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return false;
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#endif
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#endif
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}
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